Cisco Bug: CSCuo56792 - FC interface disabled due to 'bit error rate too high' when rate is low
May 05, 2020
- Cisco MDS 9000 Series Multilayer Switches
Known Affected Releases
Symptom: A Fibre Channel interface is disabled and has the following status even though the bit error rate of the interface is below the threshold specified in the Fibre Channel standards: fc1/1 is down (Error disabled - bit error rate too high) The following type of syslog messages are logged for the interface: %PORT-5-IF_DOWN_BIT_ERR_RT_THRES_EXCEEDED: %$VSAN 1%$ Interface fc1/1 is down (Error disabled - bit error rate too high) %MODULE-4-MOD_WARNING: Module 1 (Serial number: JAF1234567) reported warning on ports fc1/1 (Fibre Channel) due to MAC Bit error exceeded threshold in device DEV_TBIRD_MAC (device error 0xc9a01503) To determine if this bug has been hit, use the following command: (Where x is the slot or module number and y is the interface or port number.) <pre> slot x show process creditmon event-history <snip> 9) Event:CREDITMON_EVENT_ERR_COUNT, length:46, at 446583 usecs after Tue Apr 29 23:20:25 2014 port <y>: cur=0x6ff4 prev=0x6ff3 occurances=15 <snip> 21) Event:CREDITMON_EVENT_ERR_COUNT, length:46, at 946708 usecs after Sat Apr 26 19:57:48 2014 port <y>: cur=0x6fe7 prev=0x6fe6 occurances=1 </pre> If occurances=15 happens after 5 minutes of occurances=1 then this bug has been hit for port fcx/y. If occurances=15 happens within 5 minutes of occurances=1, then this bug has not been hit. Conditions: This issue applies to all FC switching module types.
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